Sectional flue expander



Dec. 26, 1922.

H. V. STEVENS.

sEcIloNAL FLUE FILED MAYZE EXPANDER.

INVEN TOR.

)6W5/fesse s ATTORNEY.

HENRY V. STEVENS, OF YEJVIPOlitjt,` KANSAS.

nenn

SEGTONAL @EUR EXPANDER.

and has eepecial reference to the produetion` oli' a simple andeieientexpander which is;

so constructed as to prevent the oiansliingg` 'olli the flue head whenexpanding; the flue and netting the head outward.

@their objects and advantages of the pre:- ent invention will appearthroughout the specification and olaiin.

in the drawingsz-` p Fig. l is a longitudinal section through the iiueeiqmnder3 a portion of the flue and boiler head, and

Fig. 2 is aide elevation oit the thieme pander.

By referring. to the drawing, it r-vill be seen that l designatestheilue Within which is placed the sectional flue expander1 21. The fineexpander 2 is provided with a eoncaved channel 3 extendingeircuinferentially around the flue expander between the shank il; andthe head 5 of the expander. This Coneave channel is located at a pointvvhere the bead 6 is formed at the end oi thelue l and by having theconeaved channel so formed in the flue expander 5, it will be seen thatthe lne head ivill he protected against brea- 35 ing and Crushing: andin this Way prevent the f eleetrie Weldedpeition indicated by the nu!meial T troni being;r broken or Cracked away the boiler head S.

it Should be underetood that the fine ex 40 panden may be niade of anyshape or size without departing` ,troni the `spirit oi the ini'enton :solongae the Coneaved recess or channel provided, intermediate 'the shankportion and the head 5. 1t should also be i5 innileratoed that otlierdetailed mechanical Changes may be involved Without departing Yfrom thespirit of the invention so long, aa these changes fall Within theeeopeof the appended elaine.`

.fh iu'e expander Comprising a Shank, an intermediate portion7 and a`head7 said head being spaced from the shank by Said intermediate potion7Said intermediate portion 55 having diameter smaller than the shankthereb;7 forming a channel between the channel and the head, saidchannel being substantially concave for the purpose speoiiied.

ln testimony Whereoic I afix my Signature 60 in presence of tivoWitnesses.

HENRY V. STEVENS.

YYitnesses Gno. i?. Trini, l?, S. lTLnMING.

